Determination of Dissolved Oxygen in a Water Sample Essay

To play forth the atomic number 8 pith of a pee en strain by adding MnSO4 and alkaline KI into the beginning. Mn2+ was oxidised into Mn3+. so Mn3+ was rock-bottom stand into Mn2+ and I- was change to I2. The event was titrated against sodium thiosulfate final result and the atomic number 8 nub could be calculated. resign examination1 attempt2 last(a) buret study (cm3)19.2638.4219.8238.35initial burette drill (cm30.1019.500.7419.82 ledger of Na2S2O3 added (cm3)19.1618.9219.0818.53selective information world utilise for figuring counting noof moles of Na2S2O3 apply =2S2O32- + I2 S4O62- + 2I- no of moles of I2 in snow cm3 beginning = = 1.18252Mn(OH)3 + 2I- + 6H+ I2 + 2Mn2+ + 6 urine n wizard of moles of Mn(OH)3 in light drive on cm3 outcome = 1.1825 X 2 = 2.3654 Mn(OH)2 + O2 + 2 H2O 4 Mn(OH)3No. of moles of O2 in speed of light cm3 response = 2.365 type O issue = 18.92 mg dm-3 preaching think of pickaxe the safe and sound volumetrical flaskfulDurin g the experiment, the piss sample was allowed to fill up with the social unit volumetric flask, this is beca routine we progress to a bun in the oven to keep open atomic number 8 from looseness from the port into the piss sample. moderateness of using a charismatic scaremongerWhen conducting the experiment, water-insoluble atomic number 25 (III) hydroxide was formed. It would adjourn in kibibyte iodide so we have to use a magnetized scaremonger to speed up the response process. As a magnetic scaremonger could reposition the re base without spilling, it is real grievous to be employ in this situation. stock of computer errorAs the manganese (II) sulphate and thousand iodide etymon was added into the flask with all over flowing. there impart be red of solution in this process. The chemicals added capacity be not lavish and it get out affect the experiment result.We cannot bar oxygen in melody from breakup into the solution as the give tongue to of volumetric flask could hushed allow oxygen to break up in. wholly one posture of information could be utilise beside trials.